Theory Of Flight Flashcards
What must forces and moments be in a level flight?
Forces and moments must equal 0
What are the conditions for steady flight?
Thrust = drag
Lift = weight + stabiliser lift
Sum of anticlockwise moments = sum of clockwise moments
A heavy aircraft is travelling at the glide ratio as a lighter aircraft, what must happen for them both to touch down at the same point?
The heavier aircraft must travel at a faster velocity
What equations are there for the Best Glide Ratio?
Coefficient of lift / coefficient of drag
Forward speed / downward speed
Change in horizontal distance / change in vertical distance
What must an aircraft need more of when it is banking?
Lift
What is load factor also known as?
G-load
Give the formula for load factor
And what assumptions must be made with this formula
n = L / W
Or
n = 1/cos(angle)
Assuming weight is always 1
How can extra lift be generated?
Increasing the coefficient of lift or the speed
What does the stall speed (turn) / stall speed (level) give you?
Root of the load factor
What do flaps do?
Increase the camber at the trailing edge to extend the aircrafts maximum angle of attack which generates more lift
What are the 4 different types of flaps?
Plain
Slotted
Split
Fowler
What does the fowler flap do?
Increases the wing area as well as the camber and provides up to a 90% increase in the maximum coefficient of lift
What do slats do?
Increase the camber at the leading edge which provides a high energy air path to improve boundary layer control
What may be necessary when stall occurs?
Reduce the angle of attack well below the maximum angle of attack
What is the diagram of load factor vs equivalent air speed known as?
V-n diagrams
